From 70db2bcd5b31d3ee76932d240787848e41f763a0 Mon Sep 17 00:00:00 2001
From: Paul Oliver <contact@pauloliver.dev>
Date: Tue, 14 Oct 2025 04:35:12 +0200
Subject: Adds optional compression using zlib

---
 src/salis.c | 93 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 92 insertions(+), 1 deletion(-)

(limited to 'src/salis.c')

diff --git a/src/salis.c b/src/salis.c
index 6714038..74054f6 100644
--- a/src/salis.c
+++ b/src/salis.c
@@ -16,6 +16,10 @@
 #include <string.h>
 #include <threads.h>
 
+#ifdef COMPRESS
+#include <zlib.h>
+#endif
+
 #define ACT_BENCH (1)
 #define ACT_LOAD  (2)
 #define ACT_NEW   (3)
@@ -518,7 +522,13 @@ void core_step(Core *core) {
 
 #if ACTION == ACT_LOAD || ACTION == ACT_NEW
 void salis_save(const char *path) {
-    FILE *f = fopen(path, "wb");
+#ifdef COMPRESS
+    size_t size = 0;
+    char  *in   = NULL;
+    FILE  *f    = open_memstream(&in, &size);
+#else
+    FILE  *f    = fopen(path, "wb");
+#endif
 
     assert(f);
 
@@ -529,6 +539,39 @@ void salis_save(const char *path) {
     fwrite(&g_steps, sizeof(u64), 1, f);
     fwrite(&g_syncs, sizeof(u64), 1, f);
     fclose(f);
+
+#ifdef COMPRESS
+    assert(size);
+
+    char *out = malloc(size);
+    assert(out);
+
+    z_stream strm = { 0 };
+    strm.zalloc = NULL,
+    strm.zfree  = NULL,
+    strm.opaque = NULL,
+
+    deflateInit(&strm, Z_DEFAULT_COMPRESSION);
+
+    strm.avail_in  = size;
+    strm.avail_out = size;
+    strm.next_in   = (Bytef *)in;
+    strm.next_out  = (Bytef *)out;
+
+    deflate(&strm, Z_FINISH);
+
+    FILE *fx = fopen(path, "wb");
+    assert(fx);
+
+    fwrite(&size, sizeof(size_t), 1, fx);
+    fwrite(out, sizeof(char), strm.total_out, fx);
+    fclose(fx);
+
+    deflateEnd(&strm);
+
+    free(in);
+    free(out);
+#endif
 }
 
 void salis_auto_save() {
@@ -578,7 +621,50 @@ void salis_init() {
 
 #if ACTION == ACT_LOAD
 void salis_load() {
+#ifdef COMPRESS
+    FILE *fx = fopen(SIM_PATH, "rb");
+    assert(fx);
+
+    fseek(fx, 0, SEEK_END);
+    size_t x_size = ftell(fx) - sizeof(size_t);
+    char  *in     = malloc(x_size);
+    rewind(fx);
+    assert(x_size);
+    assert(in);
+
+    size_t size = 0;
+    fread(&size, sizeof(size_t), 1, fx);
+    fread(in, 1, x_size, fx);
+    fclose(fx);
+    assert(size);
+
+    char *out = malloc(size);
+    assert(out);
+
+    z_stream strm = { 0 };
+    strm.next_in  = (Bytef *)in;
+    strm.avail_in = x_size;
+    strm.zalloc   = NULL;
+    strm.zfree    = NULL;
+    strm.opaque   = NULL;
+
+    inflateInit(&strm);
+
+    strm.avail_out = size;
+    strm.next_out  = (Bytef *)out;
+
+#ifdef NDEBUG
+    inflate(&strm, Z_FINISH);
+#else
+    assert(inflate(&strm, Z_FINISH));
+#endif
+
+    inflateEnd(&strm);
+
+    FILE *f = fmemopen(out, size, "rb");
+#else
     FILE *f = fopen(SIM_PATH, "rb");
+#endif
 
     assert(f);
 
@@ -593,6 +679,11 @@ void salis_load() {
 #pragma GCC diagnostic pop
 
     fclose(f);
+
+#ifdef COMPRESS
+    free(in);
+    free(out);
+#endif
 }
 #endif
 
-- 
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